# a02.pdf - 1 ME 3E05(2017-2018 Assignment 2[1(2 marks A...

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1 ME 3E05 (2017-2018) Assignment # 2 [1]. (2 marks) A cast-steel hub of yield strength 35 kpsi is shrunk-fitted onto a 1.5 inch SAE1035 solid steel shaft. The outer diameter and the length of the hub are 2.5 in and 4 in respectively. Assume a factor of safety of 2. [a]. What must be the interference of the hub and the shaft if the holding power of this joint is equal to the torsional yield strength of the shaft? Assume E hub = E shaft = 6 30 10 psi and 0.3. hub shaft [b]. What are the corresponding tangential and radial stresses in the hub? [c]. Now consider the hub to be made of ASTM20 cast iron 3 ( 20 10 ), y S psi and subjected to stresses obtained in part [b], will the resulting tensile stresses be safe for cast iron, again, assuming a factor of safety of 2? [2]. (3 marks) An interference fit is made between a solid circular steel bar of radius 1.5 inch and a steel disk of 10 in outer radius. The fitted component is then subjected to rotation. A contact pressure at the interface of 1200 psi is to be maintained at a rotational speed of 5000 rpm. The weight density,

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